// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: http://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == 'object' && typeof module == 'object')
    // CommonJS
    mod(require('../../lib/codemirror'), 'cjs');
  else if (typeof define == 'function' && define.amd)
    // AMD
    define(['../../lib/codemirror'], function(CM) {
      mod(CM, 'amd');
    });
  // Plain browser env
  else mod(CodeMirror, 'plain');
})(function(CodeMirror, env) {
  if (!CodeMirror.modeURL) CodeMirror.modeURL = '../mode/%N/%N.js';

  var loading = {};
  function splitCallback(cont, n) {
    var countDown = n;
    return function() {
      if (--countDown == 0) cont();
    };
  }
  function ensureDeps(mode, cont) {
    var deps = CodeMirror.modes[mode].dependencies;
    if (!deps) return cont();
    var missing = [];
    for (var i = 0; i < deps.length; ++i) {
      if (!CodeMirror.modes.hasOwnProperty(deps[i])) missing.push(deps[i]);
    }
    if (!missing.length) return cont();
    var split = splitCallback(cont, missing.length);
    for (var i = 0; i < missing.length; ++i)
      CodeMirror.requireMode(missing[i], split);
  }

  CodeMirror.requireMode = function(mode, cont) {
    if (typeof mode != 'string') mode = mode.name;
    if (CodeMirror.modes.hasOwnProperty(mode)) return ensureDeps(mode, cont);
    if (loading.hasOwnProperty(mode)) return loading[mode].push(cont);

    var file = CodeMirror.modeURL.replace(/%N/g, mode);
    if (env == 'plain') {
      var script = document.createElement('script');
      script.src = file;
      var others = document.getElementsByTagName('script')[0];
      var list = (loading[mode] = [cont]);
      CodeMirror.on(script, 'load', function() {
        ensureDeps(mode, function() {
          for (var i = 0; i < list.length; ++i) list[i]();
        });
      });
      others.parentNode.insertBefore(script, others);
    } else if (env == 'cjs') {
      require(file);
      cont();
    } else if (env == 'amd') {
      requirejs([file], cont);
    }
  };

  CodeMirror.autoLoadMode = function(instance, mode) {
    if (!CodeMirror.modes.hasOwnProperty(mode))
      CodeMirror.requireMode(mode, function() {
        instance.setOption('mode', instance.getOption('mode'));
      });
  };
});
